EP3369836B1 - Method for manufacturing hot-dip galvanized steel sheet - Google Patents

Method for manufacturing hot-dip galvanized steel sheet Download PDF

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Publication number
EP3369836B1
EP3369836B1 EP16859230.1A EP16859230A EP3369836B1 EP 3369836 B1 EP3369836 B1 EP 3369836B1 EP 16859230 A EP16859230 A EP 16859230A EP 3369836 B1 EP3369836 B1 EP 3369836B1
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EP
European Patent Office
Prior art keywords
zone
soaking zone
gas
hot
dew point
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EP16859230.1A
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German (de)
English (en)
French (fr)
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EP3369836A1 (en
EP3369836A4 (en
Inventor
Gentaro Takeda
Hideyuki Takahashi
Yoichi Makimizu
Yoshikazu Suzuki
Yoshimasa HIMEI
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JFE Steel Corp
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JFE Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

Definitions

  • the present disclosure relates to a method of producing a hot-dip galvanized steel sheet using a continuous hot-dip galvanizing apparatus that includes: an annealing furnace in which a heating zone, a soaking zone, and a cooling zone are arranged in this order; and a hot-dip galvanizing line adjacent to the cooling zone.
  • the galvannealed steel sheet is produced by, after heat-annealing the steel sheet as the base material at a temperature of about 600 °C to 900 °C in a reducing atmosphere or a non-oxidizing atmosphere, hot-dip galvanizing the steel sheet and further heat-alloying the galvanized coating.
  • Si in the steel is an oxidizable element, and is selectively oxidized in a typically used reducing atmosphere or non-oxidizing atmosphere and concentrated in the surface of the steel sheet to form an oxide.
  • This oxide decreases wettability with molten zinc in the galvanizing process, and causes non-coating.
  • Si concentration in the steel With an increase of the Si concentration in the steel, wettability decreases rapidly and non-coating occurs frequently. Even in the case where non-coating does not occur, there is still a problem of poor coating adhesion.
  • Si in the steel is selectively oxidized and concentrated in the surface of the steel sheet, a significant alloying delay arises in the alloying process after the hot-dip galvanizing, leading to considerably lower productivity.
  • JP 2010-202959 A (PTL 1) describes the following method. With use of a direct fired furnace (DFF), the surface of a steel sheet is oxidized and then the steel sheet is annealed in a reducing atmosphere to internally oxidize Si and prevent Si from being concentrated in the surface of the steel sheet, thus improving the wettability and adhesion of the hot-dip galvanized coating.
  • DFF direct fired furnace
  • the reducing annealing after heating may be performed by a conventional method (dew point: -30 °C to -40 °C).
  • WO 2007/043273 A1 (PTL 2) describes the following technique.
  • annealing is performed under the following conditions to internally oxidize Si and prevent Si from being concentrated in the surface of the steel sheet: heating or soaking the steel sheet at a steel sheet temperature in the range of at least 300 °C by indirect heating; setting the atmosphere inside the furnace in each zone to an atmosphere of 1 vol% to 10 vol% hydrogen with the balance being nitrogen and incidental impurities; setting the steel sheet end-point temperature during heating in the upstream heating zone to 550 °C or more and 750 °C or less and the dew point in the upstream heating zone to less than -25 °C; setting the dew point in the subsequent downstream heating zone and soaking zone to -30 °C or more and 0 °C or less; and setting
  • JP 2009-209397 A (PTL 3) describes the following technique. While measuring the dew point of furnace gas, the supply and discharge positions of furnace gas are changed depending on the measurement to control the dew point of the gas in the reducing furnace to be in the range of more than -30 °C and 0 °C or less, thus preventing Si from being concentrated in the surface of the steel sheet.
  • the heating furnace may be any of a direct fired furnace (DFF), a non-oxidizing furnace (NOF), and a radiant tube, but a radiant tube is preferable as it produces significantly advantageous effects.
  • EP 1 936 000 A1 (PTL 4) relates to a continuous annealing and hot dip plating method and system causing internal oxidation without causing surface oxidation of the Si in the steel and avoiding a drop in the plating ability of the steel sheet and retardation of alloying.
  • WO 2015/129202 A1 (PTL 5) relates to a method for controlling a dew point in a reducing furnace and a reducing furnace in which, even in the case of galvanizing Si-added steel, coating adhesion can be secured, alloying treatment can be performed without increasing the alloying temperature excessively, and it is possible to obtain a hot-dip galvanized steel sheet having an excellent coating appearance
  • EP 3 276 037 A1 (PTL 6) relates to a continuous hot-dip galvanizing apparatus that can inhibit roll pick-up in a soaking zone caused by condensation or the like in a humidified gas pipe, and with which favorable coating appearance can be obtained.
  • the continuous hot-dip galvanizing apparatus includes an annealing furnace in which a heating zone, a soaking zone, and a cooling zone are arranged in this order, and a hot-dip galvanizing line adjacent to the cooling zone.
  • the coating adhesion after the reduction is favorable, the amount of Si internally oxidized tends to be insufficient, and Si in the steel causes the alloying temperature to be higher than typical temperature by 30 °C to 50 °C, as a result of which the tensile strength of the steel sheet decreases. If the oxidation amount is increased to ensure a sufficient amount of Si internally oxidized, oxide scale attaches to rolls in the annealing furnace, inducing pressing flaws, i.e. pick-up defects, in the steel sheet. The means for simply increasing the oxidation amount is therefore not applicable.
  • the structure of a continuous hot-dip galvanizing apparatus 100 used in a method of producing a hot-dip galvanized steel sheet according to one of the disclosed embodiments is described first, with reference to FIG. 1 .
  • the continuous hot-dip galvanizing apparatus 100 includes: an annealing furnace 20 in which a heating zone 10, a soaking zone 12, and cooling zones 14 and 16 are arranged in this order; a hot-dip galvanizing bath 22 as a hot-dip galvanizing line adjacent to the cooling zone 16; and an alloying line 23 adjacent to the hot-dip galvanizing bath 22.
  • the heating zone 10 includes a first heating zone 10A (upstream heating zone) and a second heating zone 10B (downstream heating zone).
  • the cooling zone includes a first cooling zone 14 (rapid cooling zone) and a second cooling zone 16 (slow cooling zone).
  • a snout 18 connected to the second cooling zone 16 has its tip immersed in the hot-dip galvanizing bath 22, thus connecting the annealing furnace 20 and the hot-dip galvanizing bath 22.
  • a steel strip P is introduced from a steel strip introduction port in the lower part of the first heating zone 10A into the first heating zone 10A.
  • One or more hearth rolls are arranged in the upper and lower parts in each of the zones 10, 12, 14, and 16.
  • the steel strip P is conveyed vertically a plurality of times inside the corresponding predetermined zone in the annealing furnace 20, forming a plurality of passes. While FIG. 1 illustrates an example of having 10 passes in the soaking zone 12, 2 passes in the first cooling zone 14, and 2 passes in the second cooling zone 16, the numbers of passes are not limited to such, and may be set as appropriate depending on the processing condition.
  • the steel strip P is not folded back but changed in direction at the right angle to move to the next zone.
  • the steel strip P is thus annealed in the annealing furnace 20 by being conveyed through the heating zone 10, the soaking zone 12, and the cooling zones 14 and 16 in this order.
  • Adjacent zones in the annealing furnace 20 communicate through a communication portion connecting the upper parts or lower parts of the respective zones.
  • the first heating zone 10A and the second heating zone 10B communicate through a throat (restriction portion) connecting the upper parts of the respective zones.
  • the second heating zone 10B and the soaking zone 12 communicate through a throat connecting the lower parts of the respective zones.
  • the soaking zone 12 and the first cooling zone 14 communicate through a throat connecting the lower parts of the respective zones.
  • the first cooling zone 14 and the second cooling zone 16 communicate through a throat connecting the lower parts of the respective zones.
  • the height of each throat may be set as appropriate. To enhance the independence of the atmosphere in each zone, the height of each throat is preferably as low as possible.
  • the gas in the annealing furnace 20 flows from downstream to upstream in the furnace, and is discharged from the steel strip introduction port in the lower part of the first heating zone 10A.
  • the second heating zone 10B is a direct fired furnace (DFF).
  • the DFF may be a well-known DFF.
  • a plurality of burners are distributed on the inner wall of the direct fired furnace in the second heating zone 10B so as to face the steel strip P, although not illustrated in FIG. 1 .
  • the plurality of burners are divided into a plurality of groups, and the combustion rate and the air ratio in each group are independently controllable.
  • Combustion exhaust gas in the second heating zone 10B is supplied into the first heating zone 10A, and the steel strip P is preheated by the heat of the gas.
  • the combustion rate is a value obtained by dividing the amount of fuel gas actually introduced into a burner by the amount of fuel gas of the burner under its maximum combustion load.
  • the combustion rate at the time of combustion by the burner under its maximum combustion load is 100 %.
  • the combustion rate is preferably adjusted to 30 % or more.
  • the air ratio is a value obtained by dividing the amount of air actually introduced into a burner by the amount of air necessary for complete combustion of fuel gas.
  • the heating burners in the second heating zone 10B are divided into four groups (#1 to #4), and the three groups (#1 to #3) upstream in the steel sheet traveling direction are made up of oxidizing burners, and the last group (#4) is made up of reducing burners.
  • the air ratio of the oxidizing burners and the air ratio of the reducing burners are independently controllable.
  • the air ratio of the oxidizing burners is preferably adjusted to 0.95 or more and 1.5 or less.
  • the air ratio of the reducing burners is preferably adjusted to 0.5 or more and less than 0.95.
  • the temperature in the second heating zone 10B is preferably adjusted to 800 °C to 1200 °C.
  • the soaking zone 12 is capable of indirectly heating the steel strip P using a radiant tube (RT) (not illustrated) as heating means.
  • the average temperature Tr (°C) in the soaking zone 12 is measured by a thermocouple inserted into the soaking zone.
  • the average temperature Tr (°C) in the soaking zone 12 is preferably adjusted to 700 °C to 900 °C.
  • Reducing gas or non-oxidizing gas is supplied into the soaking zone 12.
  • the reducing gas H 2 -N 2 mixed gas is typically used.
  • An example is gas (dew point: about -60 °C) having a composition containing 1 vol% to 20 vol% H 2 with the balance being N 2 and incidental impurities.
  • An example of the non-oxidizing gas is gas (dew point: about -60 °C) having a composition containing N 2 and incidental impurities.
  • the reducing gas or non-oxidizing gas supplied into the soaking zone 12 has two forms, namely, humidified gas and dry gas.
  • dry gas is reducing gas or non-oxidizing gas having a dew point of about -60 °C to -50 °C and not humidified by a humidifying device.
  • humidity gas is gas humidified by a humidifying device to a dew point of 0 °C to 30 °C.
  • the humidified gas is supplied to the soaking zone 12 in addition to the dry gas, in order to increase the dew point in the soaking zone.
  • FIG. 2 is a schematic diagram illustrating a system of supplying the humidified gas and the dry gas to the soaking zone 12.
  • the humidified gas is supplied through three systems, namely, humidified gas supply ports 42A, 42B, and 42C, humidified gas supply ports 44A, 44B, and 44C, and humidified gas supply ports 46A, 46B, and 46C.
  • a gas distribution device 24 feeds part of the reducing gas or non-oxidizing gas (dry gas) to a humidifying device 26.
  • the remaining part passes through a dry gas pipe 32 as dry gas, and is supplied into the soaking zone 12 from dry gas supply ports 48A, 48B, 48C, and 48D.
  • the positions and number of dry gas supply ports are not limited, and may be determined as appropriate based on various conditions.
  • a plurality of dry gas supply ports are provided at the same height position.
  • the dry gas supply ports are preferably distributed evenly in the steel strip traveling direction.
  • the gas humidified in the humidifying device 26 is distributed into the three systems by a humidified gas distribution device 30, passes through respective humidified gas pipes 36, and is supplied into the soaking zone 12 from the humidified gas supply ports 42A, 42B, and 42C, the humidified gas supply ports 44A, 44B, and 44C, and the humidified gas supply ports 46A, 46B, and 46C.
  • a humidified gas supply port is provided at each of one or more locations in each of four sections obtained by dividing the soaking zone 12 into halves in the vertical direction and dividing the soaking zone 12 into halves in the entry-delivery direction. This enables uniform dew point control for the whole soaking zone 12.
  • Reference sign 38 is a humidified gas flowmeter
  • reference sign 40 is a humidified gas dew point meter. Since the dew point of the humidified gas can change due to slight dew condensation in the humidified gas pipes 34 and 36 or the like, the dew point meters 40 are desirably located immediately before the humidified gas supply ports 42, 44, and 46.
  • the humidifying device 26 includes a humidifying module having a fluorine or polyimide hollow fiber membrane, flat membrane, or the like. Dry gas flows inside the membrane, whereas pure water adjusted to a predetermined temperature in a circulating constant-temperature water bath 28 circulates outside the membrane.
  • the fluorine or polyimide hollow fiber membrane or flat membrane is a type of ion exchange membrane with affinity for water molecules.
  • the dry gas is humidified to the same dew point as the set water temperature, thus achieving highly accurate dew point control.
  • the dew point of the humidified gas can be controlled to any value in the range of 5 °C to 50 °C.
  • the pressure in the annealing furnace varies frequently depending on the combustion condition in the heating zone 10 and the cooling fan operating condition in the cooling zones 14 and 16. If the furnace pressure is excessively high, an excessive force acts on the furnace wall, which can damage the annealing furnace. If the furnace pressure is excessively low, oxygen outside the annealing furnace enters into the soaking zone 12 or the combustion gas in the heating zone 10 flows into the soaking zone 12, thus adversely affecting the steel sheet quality. Hence, such control that changes the flow rate of the gas supplied into the soaking zone 12 is typically performed so as to suppress the variation of the furnace pressure and preferably keep the furnace pressure constant.
  • the conventional control method changes not only the flow rate of the dry gas but also the flow rate of the humidified gas. Consequently, the amount of moisture supplied into the soaking zone by the humidified gas varies.
  • the soaking zone 12 needs to be constantly supplied with a necessary amount of moisture in terms of inducing internal oxidation of Si or Mn in the steel strip. If the flow rate of the humidified gas is decreased in order to suppress the variation of the furnace pressure, the amount of moisture supplied into the soaking zone 12 tends to become insufficient. This causes the dew point in the soaking zone 12 to fall below the lower limit of the appropriate range. As a result, partial non-coating occurs and degrades the coating appearance. Besides, in the operation that also involves alloying treatment, the alloying temperature tends to increase, making it impossible to obtain the desired tensile strength.
  • the variation range of the amount of moisture supplied into the soaking zone is defined as (M max - M min )/M max , where M max is a maximum amount of moisture under the same operation condition and M min is a minimum amount of moisture under the same operation condition.
  • the amount of moisture can be calculated according to the below-mentioned Formula (2).
  • the dew point of the humidified gas is kept constant to control the variation range of its flow rate to 20 % or less.
  • the amount of moisture M (g/min) introduced into the soaking zone 12 by the humidified gas needs to be adjusted depending on the volume of the soaking zone and the width and sheet passing speed of the steel strip P passing through the soaking zone 12.
  • Setting the flow rate and dew point of the humidified gas so that the amount of moisture M (g/min) supplied into the soaking zone 12 by the humidified gas satisfies the following Formula (1) is effective in obtaining favorable coating appearance: 40 + Vf W ⁇ 0.9 S + 4 / 90 ⁇ M ⁇ 60 + Vf W ⁇ 0.9 S + 4 / 90
  • Vf is the volume (m 3 ) of the soaking zone 12
  • W is the width (m) of the steel strip P passing through the soaking zone 12
  • S is the sheet passing speed (m/s) of the steel strip P.
  • the volume Vf of the soaking zone 12 is substantially a constant.
  • the width W and sheet passing speed S of the steel strip P passing through the soaking zone 12 increase or in the case where one of the width W and the sheet passing speed S is constant and the other one of the width W and the sheet passing speed S increases, the area of the steel strip in contact with the gas in the soaking zone 12 per unit time increases. Accordingly, the amount of moisture by the humidified gas is increased based on Formula (1).
  • the amount of moisture by the humidified gas needs to be decreased based on Formula (1).
  • the amount of moisture by the humidified gas is adjusted based on Formula (1). In any case, it is needed to adjust the flow rate and dew point of the humidified gas so as to satisfy Formula (1), before the dew point in the soaking zone 12 changes as a result of a change in the operation condition.
  • the flow rate Vm of the humidified gas supplied into the soaking zone 12 is not limited as long as the aforementioned control is performed, but is generally maintained in the range of 100 to 400 (Nm 3 /hr).
  • the flow rate of the dry gas supplied into the soaking zone 12 is not limited, but is generally maintained in the range of 10 to 300 (Nm 3 /hr).
  • a dew point measurement port 50 is located in a region of upper 1/2 of the soaking zone 12 in the height direction.
  • the vicinity of each humidified gas supply port is a region where the dew point is locally high, and therefore is not suitable for dew point measurement. Accordingly, the dew point measurement port 50 is located 1 m or more away from the position of each humidified gas supply port and 1 m or more away from the inner wall position of the soaking zone facing each of the supply ports.
  • the cooling zones 14 and 16 cool the steel strip P.
  • the steel strip P is cooled to about 480 °C to 530 °C in the first cooling zone 14, and cooled to about 470 °C to 500 °C in the second cooling zone 16.
  • the cooling zones 14 and 16 are also supplied with the aforementioned reducing gas or non-oxidizing gas.
  • the supply of the dry gas to the cooling zones 14 and 16 is not limited, but the dry gas is preferably supplied from introduction ports in two or more locations in the height direction and two or more locations in the longitudinal direction so that the dry gas is evenly introduced into the cooling zones.
  • the total gas flow rate Qcd of the dry gas supplied into the cooling zones 14 and 16 is measured by a gas flowmeter (not illustrated) provided in the pipe.
  • the total gas flow rate Qcd is not limited, but is set to about 200 to 1000 (Nm 3 /hr).
  • the variation of the pressure in the annealing furnace may be suppressed by adjusting only the flow rate of the dry gas supplied into the soaking zone, but is preferably suppressed by also adjusting the flow rate of the dry gas supplied into the cooling zones.
  • the hot-dip galvanizing bath 22 can be used to apply a hot-dip galvanized coating onto the steel strip P discharged from the second cooling zone 16.
  • the hot-dip galvanizing may be performed according to a usual method.
  • the alloying line 23 can be used to heat-alloy the galvanized coating applied on the steel strip P.
  • the alloying treatment may be performed according to a usual method.
  • the alloying temperature is kept from being high, thus preventing a decrease in tensile strength of the produced galvannealed steel sheet.
  • the alloying line 23 and the alloying treatment by the alloying line 23 are not essential in the present disclosure. The effect of obtaining favorable coating appearance can be achieved even in the case of not performing alloying treatment.
  • the steel strip P subjected to annealing and hot-dip galvanizing is not limited, but the advantageous effects according to the present disclosure can be effectively achieved in the case where the steel strip has a chemical composition containing 0.2 mass% or more Si, i.e. in the case of high tensile strength steel.
  • the continuous hot-dip galvanizing apparatus illustrated in FIGS. 1 and 2 was used to anneal each steel strip whose chemical composition is listed in Table 1 under each annealing condition listed in Table 2, and then hot-dip galvanize and alloy the steel strip.
  • Steel sample ID A and steel sample ID B are both high tensile strength steels.
  • time denotes the time elapsed from the operation start, where the type, sheet thickness, and sheet width of the passing steel strip and the operation condition of the continuous hot-dip galvanizing apparatus were changed with the passage of time as listed in Table 2.
  • a DFF was used as the second heating zone.
  • the heating burners were divided into four groups (#1 to #4) where the three groups (#1 to #3) upstream in the steel sheet traveling direction were made up of oxidizing burners and the last group (#4) was made up of reducing burners, and the air ratios of the oxidizing burners and reducing burners were set to the values listed in Table 2.
  • the length of each group in the steel sheet traveling direction was 4 m.
  • a RT furnace having a volume Vr of 700 m 3 was used as the soaking zone.
  • the average temperature Tr in the soaking zone was set to the value listed in Table 2.
  • gas dew point: -50 °C
  • Part of the dry gas was humidified by a humidifying device having 10 hollow fiber membrane-type humidifying modules, to prepare humidified gas. Dry gas of 500 L/min at the maximum and circulating water of 20 L/min at the maximum were flown in each module.
  • a common circulating constant-temperature water bath capable of supplying pure water of 200 L/min in total was used for each module.
  • the dry gas supply ports and the humidified gas supply ports were arranged at the positions illustrated in FIG. 2 .
  • the dew point of the humidified gas was kept constant and the variation range of the flow rate of the humidified gas was limited to 20 % or less, as listed in Table 2.
  • the furnace pressure was kept constant by adjusting the flow rate of the dry gas supplied into the soaking zone and the cooling zone.
  • the field “dew point” of the soaking zone indicates the dew point in the soaking zone measured at the position of the dew point measurement port 50 in FIG. 2 .
  • the field “dew point of vicinity of humidified gas supply port” indicates the dew point in the soaking zone measured at a position of 80 cm away from the humidified gas supply port 40B in FIG. 2 .
  • the field “dew point of humidified gas” indicates the dew point measured by the humidified gas dew point meter 40 in FIG. 2 .
  • the dry gas (dew point: -50 °C) was supplied into the first and second cooling zones from their lowermost parts with the flow rate listed in Table 2.
  • the temperature of the molten bath was set to 460 °C
  • the Al concentration in the molten bath was set to 0.130 %
  • the coating weight was adjusted to 50 g/m 2 per surface by gas wiping.
  • the line speed was set to 1.0 m/s to 2.0 m/s, with the change of the sheet thickness.
  • alloying treatment was performed in an induction heating-type alloying furnace so that the coating alloying degree (Fe content) was 10 % to 13 %.
  • the alloying temperature in the treatment is listed in Table 2.

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CN111492086B (zh) * 2017-12-22 2022-05-03 杰富意钢铁株式会社 熔融镀锌钢板的制造方法及连续熔融镀锌装置
US11384419B2 (en) * 2019-08-30 2022-07-12 Micromaierials Llc Apparatus and methods for depositing molten metal onto a foil substrate
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JP4791482B2 (ja) 2005-10-14 2011-10-12 新日本製鐵株式会社 Ｓｉを含有する鋼板の連続焼鈍溶融めっき方法及び連続焼鈍溶融めっき装置
JP5338087B2 (ja) * 2008-03-03 2013-11-13 Ｊｆｅスチール株式会社 めっき性に優れる溶融亜鉛めっき鋼板の製造方法および連続溶融亜鉛めっき設備
JP5720084B2 (ja) 2009-03-06 2015-05-20 Ｊｆｅスチール株式会社 連続溶融亜鉛めっき装置および溶融亜鉛めっき鋼板の製造方法
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EP3369836A1 (en) 2018-09-05
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US20180237896A1 (en) 2018-08-23
EP3369836A4 (en) 2018-11-07
CN108138297A (zh) 2018-06-08
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CN108138297B (zh) 2020-06-23
JP6439654B2 (ja) 2018-12-19
KR102072560B1 (ko) 2020-02-03

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